Resizing an editable combobox triggers autocomplete

[SlugFiller]

.NET version

.NET SDK (reflecting any global.json):
Version: 6.0.413
Commit: 10710f7d8e

Runtime Environment:
OS Name: Windows
OS Version: 10.0.19045
OS Platform: Windows
RID: win10-x64
Base Path: D:\Program Files\dotnet\sdk\6.0.413\

global.json file:
Not found

Host:
Version: 6.0.21
Architecture: x64
Commit: e40b3abf1b

.NET SDKs installed:
6.0.413 [D:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.21 [D:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.21 [D:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 6.0.21 [D:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Download .NET:
https://aka.ms/dotnet-download

Learn about .NET Runtimes and SDKs:
https://aka.ms/dotnet/runtimes-sdk-info

Did it work in .NET Framework?

Not tested/verified

Did it work in any of the earlier releases of .NET Core or .NET 5+?

No response

Issue description

Changing the width of an editable ComboBox, while the text contains a prefix of one of its options, causes the text to be replaced with that option. The value of AutoCompleteMode has no influence on this.

combobox_bug.webm

Steps to reproduce

• Create a combobox, setting anchors that cause it to resize with the window
• Fill the combobox with options
• Type in a text that is a prefix of one of the options
• Resize the window

Minimal reproducible program:
combobox_bug_mrp.zip

[elachlan]

@Olina-Zhang could your team please test this?

[Olina-Zhang]

Can repro this issue in .Net framework versions and .Net 6 to the latest .Net 8 RC2 build.

[JeremyKuhne]

Interesting find, putting this on the backlog (as this occurs on Framework too) if someone gets a chance to look into it.

[elachlan]

I had a similar issue in a devexpress control and it was the parent control calling invalidate that caused the autocomplete to trigger the value to be changed/selected. I imagine resizing a window would cause a similar thing to happen when anchored?

[jbennink]

Still happening with net9. I was actually testing something else and found this issue. It was easy to test in my repro and indeed this happens. I am working on my issue and hope to open a seperate issue on that soon :-|